Figure 11-20: R I V U X G
Valles Marineris (a) This mosaic of Viking Orbiter images shows the huge rift valley of Valles Marineris, which extends from west to east for more than 4000 km (2500 mi), which is approximately the width of the United States, and is 600 km (400 mi) wide at its center. Its reaches depths of 8 km (5 mi) beneath the surrounding plateau, which is over 4 times as deep as the Grand Canyon, Arizona. At its western end is the Tharsis rise. (b) This perspective image from the Mars Express spacecraft shows what you would see from a point high above the central part of Valles Marineris.
(a: USGS/NASA; b: ESA/DLR/FU Berlin, G. Neukum)